Cyphotrypa sp.

Tolokonnikova, Zoya A. & Fedorov, Petr V., 2022, Late Devonian-early Carboniferous bryozoans from Zhankurgan (Greater Karatau, Kazakhstan) - taxonomy and palaeobiogeographical implications, Zootaxa 5196 (2), pp. 252-264 : 257

Cyphotrypa sp.

Figs 3A–E , Table 2

Material. SibGIU 12/25 (sections).

Description. Massive (?ramose) colony with poorly defined exozone.Autozooecia prismatic, containing straight, slightly curved diaphragms. Distance between diaphragms 0.10–0.42 mm. Autozooecial apertures polygonal, 4 spaced per 1 mm. Exilazooecia rare, small. Acanthostyles abundant, 0.02 mm in diameter, 3–5 surrounding each aperture. Autozooecial walls laminated, merged without visible autozooecial boundaries, 0.04 mm thick in exozone.

Comparison. The present material is similar to C. olgae Tolokonnikova, 2010 from the lower Famennian of Gorny Altay ( Tolokonnikova 2010), but differs in presence of diaphragms in each autozooecial chamber and in larger distance between them (0.10–0.42 mm vs. 0.10–0.27 mm in C. olgae ), smaller exilazooecia (0.03–0.04 mm vs. 0.056 –0.098 mm in C. olgae ) and acanthostyles (0.02 mm vs. 0.042 –0.056 mm in C. olgae ). The present material differs from C. minuscula Volkova, 1974 ( Volkova 1974) from the lower Famennian of Gorny Altay in smaller apertures (0.16–0.24 mm vs. 0.20–0.30 mm in C. minuscula ) and exilazooecia (0.03–0.04 mm vs. 0.10 mm in C. minuscula ), abundant acanthostyles vs. rare ones in C. minuscula . The available material is not sufficient to make a comprehensive comparison.

Stratigraphical and geographical ranges. Ermaksy Formation, lower-middle Famennian (upper Devonian); Karatau, Zhankurgan outcrop, Kazakhstan.

Figures

FIGURE 3. Early-middle Famennian bryozoans from Zhankurgan outcrop. SibGIU 12/25: A-E Cyphotrypa sp. A, B. transverse section; C, D. longitudinal section showing abundant diaphragms (arrow) and wall microstructure with bulges; E. tangential section. SibGIU 12/26: F, G Anomalotoechus sp. F. tangential section; G. transverse section; SibGIU 12/27: H, I Pseudobatostomella sp. H, I. longitudinal section showing short exilazooecia (arrow).